The highest point in Maryland is only accessible by hiking through another state.

This claimant to the title of "smallest church in the 48 states" doubles as an equally tiny, quasi-post office.

Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

One woman's Viking Castle on Lake Tahoe.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

The rusting remains of the largest assembled WWII fleet on the West Coast.

This cabin from the 1850s is one of the first structures built by Chinese immigrants in California.

Haunting and beautiful trees, doomed to die.

Fake rail crossings mark the site of an influential doctor's demise.

Steinbeck's old stomping grounds, immortalized in Cannery Row.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A derelict bit of transportation infrastructure hidden in the woods.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.